Spanish architect Santiago Calatrava — famous on this side of the pond for designing the now-on-hold Chicago Spire — is tossing aside spirals in favor of the double helix. He's designed the Peace Bridge for Calgary, Canada: a roughly 425-foot tube that'll comfortably facilitate both walking and biking. The cool design isn't open air, though — the tube is enclosed by glass, making it perfect for walks even in the rain or snow.

The $24.5 million will be finished in 2010 if everything lines up, and is expected to enjoy the company of 5,000 Canadians daily. Click Continue to see a bigger, purtier picture of Calatrava's Peace Bridge.

Click it and it gets bigger!

World Architecture News, via Arch Daily, via Inhabitat